Well, then it must be true. I mean even though there is lots of data supporting what wk057 has reported in the opening post
Well, it's the lack of data that led me to reply here in the first place.
If one wants to make a technical claim, argument or comparison, they need to provide the data, conditions and peer-review-able technical reporting to back it up.
Too much info is missing in the OP, but from what was said, I can point out the errors and missing information:
-500mA is too high of a current draw to make a Wh capacity determination. A quasistatc discharge rate needs to be used - or in its place a better proxy, such as a pulse discharge or a very slow discharge rate.
-Charge voltage needs to be specified
-Charge cut current needs to be specified
-Discharge cut voltage needs to be specified
-Test temperature needs to be specified
-Kelvin, aka, 2-wire voltage measurement needs to be used.
Reporting also serves another purpose - one should demonstrate they have the technical understanding to even proceed with the experiment, calculations and conclusion they come to. For example, Watts - especially Watt Hours, is not a measurable quantity - it can only be calculated. Thus, one should understand possible sources of error and uncertainty in the measured quantities and how they combine in the final calculation.
Furthermore, Measuring Watts or Watt Hours of a specific period of time of the energy consumed by some device is
trivial compared to making a Watt Hour capacity determination of a battery. The second is subject to an order of magnitude of additional variables - such as some of what I specified above. (and it was not a complete list)
Thus - measurement of the energy capacity of battery becomes as much of a matter of opinion (aka - a massive set of conditions need to be agreed upon and standardized) as it is scientific fact. One should point out which variables are subject to opinion and which variables are sources of error in a measurement.
All of the items I pointed out in the list above are sources of actual technical error in the measurement, not the variables that will be subject to opinion - aka - standardization - when making a battery Watt Hour determination. Those will be things such as - acceptable cycle life, calendar life. energy buffer built into the system design, etc.
*off-topic drivel deleted